AEM Induction 21-5011 4-Inch Universal Cold Air Intake System

AEM's 21-5011 is ideal for engine swaps when a custom intake is required. It comes with an AEM Dryflow Air Filter, three 4 inch diameter aluminum tube bends, one straight 36 inch long, 4 inch diameter tube, seven couplers, a weld-on mass air flow sensor pad, two brackets and hardware needed to custom build an air intake. AEM's 21-5011 is ideal for engine swaps when a 4 inch diameter custom air intake is required. Associated products: AEM-1-4001 Air Filter Wrap, AEM-21-2059DK AEM DryFlow Air Filter, AEM-1-1000 Air Filter Cleaner

• Limited Lifetime Warranty
• Manufactured in the USA

The AEM Induction 21-5011 4-Inch Universal Cold Air Intake System is designed for engine swaps, custom builds, and applications that require a universal 4-inch air intake. This kit provides the core components needed to create a customized intake routing while supporting consistent airflow to the engine. Its modular design makes it suitable for performance enthusiasts, fabricators, and installers who need flexibility during a custom installation.

The system includes an AEM Dryflow air filter, aluminum intake tube sections, couplers, a weld-on mass air flow sensor pad, mounting brackets, and installation hardware. The filter is washable and reusable, helping reduce ongoing replacement needs when maintained with the appropriate service products. AEM Induction manufactures this kit in the USA and backs it with a limited lifetime warranty.

Key Product Specifications & Technical Data

• Brand: AEM Induction
• Part Number: 21-5011
• Product Type: Universal cold air intake system
• Intake Tube Diameter: 4 inches
• Tube Material: Aluminum
• Air Filter Type: AEM Dryflow washable and reusable filter
• Mass Air Flow Provision: Weld-on sensor pad included
• Manufacturing Origin: Made in the USA

Fitment

The AEM Induction 21-5011 is a universal system intended for custom engine swap and custom intake applications requiring a 4-inch intake tube. Vehicle-specific fitment is not provided; installation may require cutting, fabrication, sensor placement, and custom routing. This product is not CARB approved and may require acknowledgment of applicable emissions restrictions before installation or use.

What's Included

• AEM Dryflow air filter
• Three 4-inch aluminum tube bends
• One straight 4-inch aluminum tube
• Seven couplers
• Weld-on mass air flow sensor pad
• Two mounting brackets
• Installation hardware

Associated maintenance products include the AEM 1-4001 Air Filter Wrap, AEM 21-2059DK Dryflow Air Filter, and AEM 1-1000 Air Filter Cleaner.

Features:

• Custom Engine Swap Fitment: Designed for custom engine swaps and universal 4-inch intake applications.
• Modular Intake Construction: Includes aluminum tube sections and multiple couplers for flexible intake routing.
• Dryflow Air Filtration: Features a washable and reusable AEM Dryflow air filter for convenient maintenance.
• Mass Air Flow Sensor Provision: Includes a weld-on mass air flow sensor pad to support custom sensor installation.

Air Freight Prohibited: false
Not Carb Approved: true
Carb Acknowledgement Required: true
Ltl Freight Required: false
Prop 65: Y
Part Type: automotive
Epa: N/A
Regular Stock: t
Units Per Sku: 1